A set of protest signs. These are functionally Lego tiles (2x2 or 2x3) with a bar attached so they can be held like signs. There's also a 2x2 plate sign which you can then attach other tiles or such for different sized signs (two 2x4 tiles would make a nice large sign) or could use to make something wider with two of those and some pieces linking them, like two people holding up a really wide banner.